Lock



FIG. 1 is a perspective view of a lock showing my new design;

FIG. 2 is a front view of the lock thereof;

FIG. 3 is a rear view of the lock thereof;

FIG. 4 is a right view of the lock thereof;

FIG. 5 is a left view of the lock thereof;

FIG. 6 is a top view of the lock thereof; and,

FIG. 7 is a bottom view of the lock thereof.

The shade lines in the Figures show contour and not surface ornamentation. 

CLAIM The ornamental design for a lock, as shown and described. 